Pump



FIG. 1 is a top, left, front perspective view of a pump showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front side elevational view thereof, the back side elevational view thereof being a mirror image of the front side shown;

FIG. 4 is a right end elevational view thereof;

FIG. 5 is a left end elevational view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken line representations in the figures are for the purpose of illustration only and form no part of the claimed design. 

The ornamental design for a pump, as shown and described. 